Revise Emscripten optimizations

Makefile

@@ -106,7 +106,7 @@ ifneq (,$(strip $(findstring $(TARGETTYPE), WebAssembly)))
 	# - Modularize:   https://emscripten.org/docs/getting_started/FAQ.html#can-i-use-multiple-emscripten-compiled-programs-on-one-web-page
 	# - Environment:  https://emscripten.org/docs/getting_started/FAQ.html#can-i-build-javascript-that-only-runs-on-the-web
 	# - Single File:  https://emscripten.org/docs/compiling/Building-Projects.html?highlight=SINGLE_FILE#emscripten-linker-output-files
-	CFLAGS_EXEC += --shell-file ./emscripten/webnqc_shell.html -s EXPORT_NAME=createWebNqc  -s EXPORTED_RUNTIME_METHODS='["callMain","FS"]' \
+	CFLAGS_EXEC += -Os --shell-file ./emscripten/webnqc_shell.html -s EXPORT_NAME=createWebNqc  -s EXPORTED_RUNTIME_METHODS='["callMain","FS"]' \
 		-s INVOKE_RUN=false  -s MODULARIZE=1  -s ENVIRONMENT=web  -s WASM=0
 else
 ifneq (,$(strip $(findstring $(OSTYPE), Darwin)))
@@ -209,7 +209,7 @@ exec: info $(EXEC_DIR)/nqc$(EXEC_EXT)
 
 $(EXEC_DIR)/nqc$(EXEC_EXT): compiler/parse.cpp $(OBJ)
 	$(MKDIR) $(dir $@)
-	$(CXX) -o $@ $(CFLAGS) $(CFLAGS_EXEC) $(OBJ) $(LIBS)
+	$(CXX) -o $@ $(CFLAGS_EXEC) $(OBJ) $(LIBS)
 
 #
 # Emscripten build for WebAssembly